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Photovoltaic power station direct current boosting collection access system and control and protection method thereof

A DC boost, photovoltaic power station technology, applied in photovoltaic power generation, electrical components, circuit devices, etc., can solve the problem of unable to guarantee the safe and reliable operation of photovoltaic power stations, and achieve the effect of improving safe and stable operation capability and safe, stable and reliable operation

Active Publication Date: 2018-09-14
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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Problems solved by technology

[0005] This application provides a photovoltaic power station DC boost collection access system and its control and protection method to solve the problem that the traditional protection method cannot guarantee the safe and reliable operation of the photovoltaic power station when it is connected to the large power grid in the form of DC boost collection

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  • Photovoltaic power station direct current boosting collection access system and control and protection method thereof
  • Photovoltaic power station direct current boosting collection access system and control and protection method thereof
  • Photovoltaic power station direct current boosting collection access system and control and protection method thereof

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Embodiment Construction

[0055] figure 1 This is a schematic diagram of the topology structure of the DC boost collection access system of the photovoltaic power station provided in the embodiment of the present application.

[0056] see figure 1 , The photovoltaic power station DC boost collection access system provided by the embodiment of the present application includes: a power generation unit 1 and a collection and transmission unit 2 . The large-scale photovoltaic power station DC boost collection access system is mainly composed of two parts: the power generation unit 1 composed of the photovoltaic array module 11 and the DC / DC converter 12; the low voltage and high voltage collection lines, the boost converter 21 and the inverter converter The collection and conveying unit 2 composed of 22. Large-scale photovoltaic power plants often use MPPT control; the DC / DC converter 12 can improve the quality of the DC voltage output by the photovoltaic array and stabilize the DC voltage; the DC voltag...

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Abstract

The present invention discloses a photovoltaic power station direct current boosting collection access system and a control and protection method thereof. The system comprises a generation unit and acollection transmission unit, the generation unit formed by a photovoltaic array module and a DC / DC converter outputs a direct current, the direct current is subjected to direct current boosting through a boosting converter, is collected in a combiner box for uniform output and is converted to an alternating current through an inversion converter to be merged into a large power grid. The system fully employs the controllability of the DC / DC converter, the inversion converter and the boosting converter and the reliability of the protection device to avoid the problems in an alternating currentmode so as to improve the safe and stable operation capacity of the photovoltaic power station direct current boosting collection access system. The control and protection method performs control andprotection segmentation and control and protection layering processing of the system to perform accurate control and protection of the system through coordination between the system control and protection subareas and the system control and protection layers so as to achieve safe, stable and reliable operation when the photovoltaic power station accesses the large power grid in the direct currentboosting collection mode.

Description

technical field [0001] The present application relates to the technical field of new energy power generation and grid connection, and in particular, to a DC boost collection access system for photovoltaic power plants and a control and protection method thereof. Background technique [0002] Traditional energy power generation will emit a lot of greenhouse gases and other pollutants, causing serious environmental problems, and the reserves of fossil energy are decreasing year by year, which makes the renewable clean energy power generation technology develop rapidly. Among them, photovoltaic power generation has developed rapidly as the most potential renewable clean energy power generation technology. It can be seen that the research on solar photovoltaic power plants has huge advantages. Compared with small photovoltaic power generation systems, large photovoltaic power plants can utilize solar energy more concentratedly, fully and efficiently, and can meet the grid-friend...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/38
CPCH02J3/383Y02E10/56
Inventor 奚鑫泽李胜男徐志邢超张少泉陈晓云
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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